Oku was really lost. This arc was insanely long and what happened really (development wise). Not so much that it would require such an odyssee.
In the time it took to do this arc, Oku could've done two missions (a long hard one and a short) with the same or even more development in it.
I hope something like this won't happen again.
"For Feanor was made the mightiest in all parts of body and mind, in valour, in endurance, in beauty, in understanding, in skill, in strength and subtlety alike, of all the Children of Illuvatar, and a bright flame was in him"